Euryoryzomys nitidus (Thomas, 1884)

Moreira, Camila Do Nascimento, Ventura, Karen, Percequillo, Alexandre Reis & Yonenaga-Yassuda, Yatiyo, 2020, A review on the cytogenetics of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae), with the description of new karyotypes, Zootaxa 4876 (1), pp. 1-111 : 16

Euryoryzomys nitidus

Karyotype: 2n = 80 and FN = 86. Autosomal complement: four small metacentric pairs, and 35 acrocentric pairs (one distinctly large and the remaining large to small decreasing in size). Sex chromosomes: X, a very large subtelocentric; Y, a small acrocentric ( Gardner & Patton 1976, pp. 4, Fig. 1E ; Patton et al. 2000). A different morphology of sex chromosomes was reported by Volobouev & Aniskin (2000), a submetacentric X and a metacentric Y chromosome. C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of all autosomes. The short arm of X and the Y were entirely heterochromatic. G-banding was also performed ( Volobouev & Aniskin 2000). FISH with telomeric sequences revealed signals exclusively at the ends of all chromosome arms and no interstitial signals were observed ( Silva et al. 2000).

Figures

FIGURE 1. Collection localities of Oryzomyini species analyzed in this work. (1) Claúdia, Mato Grosso state; (2) and (3) Rio Japurá, Amazonas state; (4) and (5) Rio Içá, Amazonas state.